Safety



W. S. LEVIN.

RELAY. APPLICATION FILED MAY5, 1915.'

Patented June 3, 1919.

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W; S` LEVIN.

RELAY.

APPLICATION FILED MAY 5. I9I5.

2 SHEETS-SHEET 2.

' 1,305,381. Pmndlune 3,1919.-

UNITED sTATEs PATENT oEEioE.

WALTER S. LEVIN, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO THE NATIONALSAFETY APPLIANCE COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORA- TIONOF CALIFORNIA.

RELAY.

Specification of Letters Patent.

Patented June 3, 1919.

Application ledMay 5, 1915. Serial No. 25,895.

To all 'whom t may concern.'

Be it known that 1, WALTER S. LEVIN, a citizen of the United States, anda resident of San Francisco, county of San Francisco, State ofCalifornia, have invented certain new and useful Improvements in Relays,of which the following is a description.

This invention relates to relays and to that class thereof which isespecially useful in line circuits and train signaling and stoppingapparatus. One of these relays is to be used at every signal orautomatic stop location and is supplied with current through thenecessary line wires connected with a proper battery through thevcontacts of a track relay which in turn is connected, through the rails,with a battery at theJ other end of a neighboring blockthe `pres*- enceof a. train in this block shunting the current of the track relay thuscausing it to drop its armature and open the circuit of the line relaywhich in turn drops its armature thus setting the proper caution anddanger signals. One of the objects of the present invention is to makethe use lof the back contact, which in all previous patterns of relaysis held closed only by the weight of the armature, just as secure as thefront contact normally used and this object has been obtained by theconstruction of the present invention which makes the back contacts justas secure as, or more so than, the front contacts of relays heretoforecommonly used. Other objects will appear from the hereinafterdescription.

The invention will be understood by one skilled 'in the art from thefollowing description taken in connection with the accompanying drawingswherein the same reference character indicates the same part in theseveral views.

Referring to the drawings:

Figure 1 is a cross sectional View, partly in elevation, illustratingone embodiment of the invention.

Fig. 2 is a horizontal section on staggered line 2 2 of Fig. 1.

Fig. 3 is a cross sectional view 0n line 3-3 of Fig. 1. y

Fig. 4 is a perspective view showing diagrammatically a simpleembodiment of the invention.

. On the drawing the part marked 10 represents a casing, to the cover 11of which 'are secured the several parts of the relay.

A represents a pair of electromagnets the windings of which areconnected by wires R through a contact make and break device S to abattery T. These magnets are provided with L-shaped-pole pieces B whichmay be formed integral with the cores A. The two members are markedrespectively, b1, b2, the latter being a projection on the ordinary formof pole piece b1. b3 represents screws which pass through the polepieces and are screwed into the cover 11. O is an armature to which aresecured the arms c1 and by which the armature is pivoted at 02 to lugs12 on the cover 11. H 1sanother armature to which are secured the armsh1 by which the said armature is pivoted at 71.2 to lugs 13 projectingfrom the cover of the casing. The armatures are so constructed'andarranged that they coact respectively with the members b1 and b2 of thepole pieces B, and the movement of one is entirely free and independentof the movement of the other. D represents pieces or blocks ofinsulating material secured to the armature O and to which are securedthe contact arms F and which insulate the said arms from the armatures.D is another 'piece of insulating material secured to the armature H andto which the Contact arm E is secured and by which said arm is insulatedfrom the said armature H. G is an electromagnet supported by theL-shaped brackets 14 secured to the cover of the casing. The brackets 14aiford respectively 'suitable supports fora block of insulating material15 to carry suitable terminals or binding posts 16 to which the wiringshown diagrammatically in Fig. 4 may in practice be connected. Thismagnet is provided with vupwardly extending pole pieces N which are soarranged that they attract the armature C but have no influence on thearmature H so as to effect its practical operation. In other words, noappreciable influence is exerted upon the armature H. In the'diagrammatic view of'Fig. 4, for the purpose of clearer illustration,this magnet is shown elongated and the pole pieces near Vthe end of thearmature C, but in practice when the said arms are held up bythe-magnets A. The letters K'represent the back contacts respectivelyfor each ofthe arms F, and K the back contact for the arm E and againstwhich the said arms rest when they have been released from the magnetsupon the opening ofthe said magnet circuit. M represents terminals orbinding Vposts connected to the Contact "arms `F by fiexible connectionsL, and M is another terminalor binding post connected to the arm E by `aflexible connection L, Vthe said terminals being used to connectsuitable wiring. C represents circuit wires,one section of whichconnects the magnet'G tothe back contact K, and the other sectionofwhich connects said magnet with the nterminal or post M, throughthebattery P.

The contact arm E is used only forcon-` trolling the circuit of theelectromagnet'-G, while 'the arms F are used for 'controlling externalcircuits, any-number of which may be used, only two being shown forillustrating the action of the relay.

The operation of theV inventionfmay be briefly stated as follows :k Vhenthe magnets A are energized by operating vthe contact making device S,the armatures C and H are drawn in contact with the pole pieces B andthe contact arms F and E are'held firmly against the front contacts Iand I. When the circuit of the magnet is broken by opening' the contactdevice S, the magnets A are deenergized, the armatures C and H arereleased fromthe pole pieces and drop away therefrom and the respectivecontact arms Fand E carried thereby come into en.

gagement with the back contacts IK and K respectively. The closingof-the contact between E and K causes the magnet G to'be energized,whereupon the armature C is attracted-by the pole pieces N and thecontact arms F connected to ythe armature C are firmly held against theback contacts -l/Vhen the magnets vA are again energized, the 4armatureC will not immediately be raised, as it is held down by the magnet G,but'the poleeXtension b2 attracts the armature H which raisesthe arm Eout of engagenient with the contact K to open the circuit O, whereuponthe magnet Gr is denergized and the armature 'C is released 'from thepoles N of the magnets A, whereupon the arms carried thereby are Vraisedand 'held against the front Ycontacts I. If desired, the ends of all ofthe contact arms may be provided with contact l'ingers el, e2, and f1,f?, as shown-in Figs. 1 and 3, which may be made 'of spring metalvwhereby a yielding engagement with the frontrandbackrcntacts may besecured. y Y

As'many changes could be .made in the yabove construction and manyapparently widely different embodiments vof the invention could be madewithout departing from lthescope thereof, I intend that all matter'contained in the above description or shown in the accompanyingdrawings shall be interpreted as illustrative and not in a limitingsense.

I desire it also to be understood that modifications ofthe structure maybe made which fall within the scope of the claims.

Having now described my invention, what I claim as new and desire tosecure by Letters Patent is:

l. In'a 'device of the class described, an electrolmagnet having a polepiece with a projection connectedthereto, an armature to bea'ttract'e'd'by vthe pole piece, another armature tobe "separately andindependently attracted bythe sai'd projection, a contact armconnected'to e'ach armature, frontand rear contacts against whichthearms Contactin one position or`the other, a second magnet, anda circuitconnecting said second magnet and the arm connected to the secondmentioned armature, said circuit being opened when the first magnet isenergized and closed when the said 'iirst magnet is denergized, wherebythese'co'nd magnet is energized and holdsthe arm connectedto'the irstarmature incontact with the back contact.

2. In a device of the class described, an electromagnet, an -L-shapedpole piece therefor, an armature-attracted by one member ofthe said polepiece, another armature attracted by the other member"thereofindependently of the first armature, contact arms carried byture,lanother contact arm carried by the second armature, front and backcontacts for each arm, another electromagnet to attract the firstmentioned armature andhold the first mentioned arms in contact with theback contacts, the second magnet being in circuit with the arm carriedby the second armature andthe back contactther'eof and energized whenthe'irst mentioned magnet isldenergized i V3. In a device of the classdescribed, an electromagnet, a pole Ypiece therefor, said pole piececonsisting of amain memberl and asecond member, a hinged armatureadapted to be attracted by the main member of the said pole piece whenthe magnetis energized, a second hinged armature adapted to be attractedby the second member of the pole piece independently of the firstarmature when the magnet is energized, contact arms connected 'to andinsulated from the rst mentioned armature, an arm connected to andinsulated from the second mentioned armature, front and Aback contactsforeach varnna second magnet having pole 'pieces adjacent to and adaptedto attract the first mentioned armature, said magnet being incircuitwith the last mentioned arm andthe the -first mentioned armathesecond magnet Will be energized through the last mentioned arm and itsback contact and will hold the arms carried by the first mentionedarmature against the back contacts thereof, and upon the first mentionedmagnet being energized the second mentioned arm Will be attracted by onemember of the pole pieces independently of the first armature and breakthe circuit of the second magnet, whereupon the first mentioned armaturewill be attracted by the pole piece and the first mentioned arms will beheld in engagement with the front contacts.

4. In a device of the class described, an electro-magnet having a coreprovided With an L-shaped pole piece, the separate arms of saidVL-shaped pole piece adapted to independently attract separate armatures,and armatures therefor, each armatureroperating respectively with aseparate arm of said L-shaped pole piece.

5. In a device of the class described, a support, an electromagnetsecured thereto, a second electromagnet secured to the said support polepieces for each magnet secured adjacent to each other, nested armaturessecured to the support and cooperating respeetively with separateportions of the pole piece of the first mentioned magnet, one of saidarmatures also coperating with the pole piece of the said second magnet,fixed contacts and contact arms insulatively connected With therespective armatures.

6. In a device of the class described, a support, an electromagnetsecured thereto, a second electromagnet also secured to the saidsupport, a stepped pole piece for the first mentioned magnet Dole piecefor the second magnet, nested armatures pivotally secured to the supportand cooperating respectively with the separate portions of said steppedpole piece, one of said armatures also coperating With the pole piece ofsaid second magnet, fixed contacts and Contact arms insulativelyconnected with the respective armatures.

In Witness whereof, I have hereunto set my hand at San Francisco, countyof San Francisco, State of California, this 26th day of April, 1915.

VALTER S. LEVIN.

In presence of- Gnonen C. FAULKNER, GoLDAH CHARMAK.

Copies 9! this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

